Apple approved a Mac calendar app with a broken crypto-miner

Apple Mac app 'Calendar 2' automatically mined cryptocurrency despite users opting out

Everyone is looking to make a buck with cryptocurrency these days, and unfortunately it has gotten to the point where even unrelated apps and websites are prone to using your device's resources for mining, often without the user's consent.

It looks like battery-draining cryptocurrency miners aren't a problem for Google Play market anymore.

Calendar 2 is a scheduling app that is a bit more robust than the one that Apple includes with macOS. Calendar 2's developers did take measures to prevent the miner from impacting on users.

Until Calendar 2, the Mac App Store had not featured an app with a crypto unlock option. Qbix showed it in a Preferences menu, and said that it would start mining only if the user enabled the feature, selecting it over a recurring 99 cent monthly charge or $17.99 one-time fee for "all new and future" features.

"I didn't expect a miner infection from an App Store vendor", Laxton mused on Twitter. Ars Technica discovered the popular Mac app Calendar 2 has recently added a cryptocurrency miner in what's thought to be the first example inside the Mac App Store. That is not the only potential issue, though. However, the app has been bugged and has been mining Monero coin by default. Apparently, the miner was supposed to devote only 10-20 percent of a machine's power to mining, but instead was taking at least 40 percent, perhaps more.

Magarshak also explained that the company that provided the miner didn't disclose its code so it would take Qbix too long to fix the root cause of the bugs. In an updated statement, Qbix said it has chose to remove the miner altogether, saying that the company that provided the miner library did not disclose the source code and it would take too long to dig through it and fix the buggy behavior. We don't want to get sucked into this set of incentives, and hopefully our decision to ultimately remove the miner will set some sort of precedent for other apps as well. It's still unclear as to why the app is allowed to stay on the Mac App Store.

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